3868687921 has 16 divisors (see below), whose sum is σ = 4555549440. Its totient is φ = 3215954880.

The previous prime is 3868687897. The next prime is 3868687961. The reversal of 3868687921 is 1297868683.

It is a cyclic number.

It is not a de Polignac number, because 3868687921 - 2¹⁷ = 3868556849 is a prime.

It is a Duffinian number.

Its product of digits (6967296) is a multiple of the sum of its prime divisors (48384).

It is not an unprimeable number, because it can be changed into a prime (3868687961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56535 + ... + 104563.

It is an arithmetic number, because the mean of its divisors is an integer number (284721840).

Almost surely, 2^3868687921 is an apocalyptic number.

It is an amenable number.

3868687921 is a deficient number, since it is larger than the sum of its proper divisors (686861519).

3868687921 is a wasteful number, since it uses less digits than its factorization.

3868687921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48384.

The product of its digits is 6967296, while the sum is 58.

The square root of 3868687921 is about 62198.7774879860. Note that the first 3 decimals coincide. The cubic root of 3868687921 is about 1569.8370178495.

The spelling of 3868687921 in words is "three billion, eight hundred sixty-eight million, six hundred eighty-seven thousand, nine hundred twenty-one".